source for hold down nut on a supra stab?

Im looking for a replacement nut and am having no success. Im not sure how to even describe the nut (countersunk nut with slot?) and I think they're 5mm.
Looking for a source before next weekend...thanks!

Charlie

BTW I checked KC's web site first and it looks like he's out of town till the 14th

Yes, they are called Sex Nuts but nobody in existence carries them nor knows where to find them. I tried my local wholesale fastener supply company and Fastenal and neither knew where to find such an animal.
Vlad has a Monopoly on them, the only places I've ever had luck is Barry or Neil.

Anyone know what thread? If we knew what thread, it wouldn't be hard to make our own from some other nut or standoff.

I measured the male thread on the wrecked Supra fuse I have at 0.110", which doesn't seem like metric, more like a #4. But a 4-40 nut won't fit. The same nut fits a wrecked Ava fuse I have. Could it be a 4-48? I don't think I've ever heard of M2.8 thread. Might it be an M3 running way undersize?